Manufacture of low polarization mode dispersion single mode optical fibers and products thereby

Abstract

A process for preparing the single-mode optical fibre with low polarization mode dispension features that a kneading system installed at downstream of drawing tower has a kneading wheel whose axis is periodically swinging in the plane parallel to drawing direction, and when the keading wheel is driven by high-speed moving optical fibre to show an angle, the generated torsion is transmitted to the softened glass body at upstream to generate the plastic deformation and solidify it in optical fibre, resulting in disordered non-sine torsion distribution to lower the polarization mode dispersion.

Description

technical field [0001] The invention relates to a manufacturing method of a single-mode optical fiber, in particular to a manufacturing method of a PMD single-mode optical fiber with low polarization mode dispersion. The invention also relates to optical fibers prepared by this method. Background technique [0002] In recent years, with the rapid growth of people's demand for communication bandwidth, the single-channel transmission rate of telecommunications backbone networks in many countries is developing from Gb / s level to Tb / s level, which should be attributed to the erbium-doped fiber amplifier EDFA and other optical devices Applications. However, they also bring about a serious problem, which is to accumulate the original small polarization effects, such as polarization mode dispersion PMD, polarization dependent loss PDL and other adverse effects, and finally have a non-negligible impact on the optical fiber communication system. Since PDL is m...

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Problems solved by technology

However, the implementation method introduced in the above patent changes the path of the optical fiber in the original drawing process, causing the optical fiber to deviate from the alignment of the drawing system. This implementation method is not conducive to the process control of the normal drawing process and increases the difficulty of equipment maintenance. At the same time, the resistance to the forced rotation of the optical fiber is increased, which weakens the ability of the rubbing system introduced in the above patent to generate torque

In addition, the above-mentioned patent introduces that the prerequisite for a good rubbing effect by rubbing is that the optical fiber is in close contact with the surface of the rubbing wheel, but the force between them comes from the horizontal component force of the drawing traction force, and its magnitude depends on the optical fiber on the surface of the rubbing wheel. At the same time, considering the sliding of the optical fiber on the surface of the rubbing wheel, it is certain that the optical fiber will inevitably jump on the surface of the rubbing wheel, and it cannot ensure that the torque of the rubbing wheel is effectively transmitted to the optical fiber.

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